/*
 * Copyright [2021-present] [ahoo wang <ahoowang@qq.com> (https://github.com/Ahoo-Wang)].
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *      http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package me.ahoo.wow.serialization.state

import com.fasterxml.jackson.core.JsonGenerator
import com.fasterxml.jackson.databind.JsonNode
import com.fasterxml.jackson.databind.SerializerProvider
import me.ahoo.wow.eventsourcing.snapshot.SimpleSnapshot
import me.ahoo.wow.eventsourcing.snapshot.Snapshot
import me.ahoo.wow.modeling.state.ReadOnlyStateAggregate

object SnapshotRecords {
    const val SNAPSHOT_TIME: String = "snapshotTime"
}

object SnapshotSerializer : AbstractStateAggregateSerializer<Snapshot<*>>(Snapshot::class.java) {

    override fun writeExtend(value: Snapshot<*>, generator: JsonGenerator, provider: SerializerProvider) {
        generator.writeNumberField(SnapshotRecords.SNAPSHOT_TIME, value.snapshotTime)
    }
}

object SnapshotDeserializer : AbstractStateAggregateDeserializer<Snapshot<*>>(Snapshot::class.java) {

    override fun createStateAggregate(stateRecord: JsonNode, stateAggregate: ReadOnlyStateAggregate<Any>): Snapshot<*> {
        val snapshotTime = stateRecord[SnapshotRecords.SNAPSHOT_TIME].asLong()
        return SimpleSnapshot(delegate = stateAggregate, snapshotTime = snapshotTime)
    }
}
